Buggy code:
public final class PhoneAccountRegistrar { public static final PhoneAccountHandle NO_ACCOUNT_SELECTED = new PhoneAccountHandle ( new ComponentName ( "null" , "null" ) , "NO_ACCOUNT_SELECTED" ) ; public static abstract class Listener { public void onAccountsChanged ( PhoneAccountRegistrar registrar ) { } public void onDefaultOutgoingChanged ( PhoneAccountRegistrar registrar ) { } public void onSimCallManagerChanged ( PhoneAccountRegistrar registrar ) { } } private static final String FILE_NAME = "phone-account-registrar-state.xml" ; @ VisibleForTesting public static final int EXPECTED_STATE_VERSION = 8 ; private static final String SIP_SHARED_PREFERENCES = "SIP_PREFERENCES" ; private final List < PhoneAccountRegistrar . Listener > mListeners = new CopyOnWriteArrayList < > ( ) ; private final AtomicFile mAtomicFile ; private final Context mContext ; private final UserManager mUserManager ; private final SubscriptionManager mSubscriptionManager ; private PhoneAccountRegistrar . State mState ; private UserHandle mCurrentUserHandle ; @ VisibleForTesting public PhoneAccountRegistrar ( Context context ) { } @ VisibleForTesting public PhoneAccountRegistrar ( Context context , String fileName ) { } public int getSubscriptionIdForPhoneAccount ( PhoneAccountHandle accountHandle ) { } public PhoneAccountHandle getOutgoingPhoneAccountForScheme ( String uriScheme ) { } PhoneAccountHandle getUserSelectedOutgoingPhoneAccount ( ) { PhoneAccount account = getPhoneAccountCheckCallingUser ( mState . defaultOutgoing ) ; if ( account != null ) { return mState . defaultOutgoing ; } <START_BUG> if ( ( ( TelephonyManager . getDefault ( ) . getPhoneCount ( ) ) > 1 ) && ( ( mSubscriptionManager . getActiveSubscriptionInfoCount ( ) ) == 1 ) ) { <END_BUG> return getUserSelectedVoicePhoneAccount ( ) ; } return null ; } PhoneAccountHandle getUserSelectedVoicePhoneAccount ( ) { } public void setUserSelectedOutgoingPhoneAccount ( PhoneAccountHandle accountHandle ) { } boolean isUserSelectedSmsPhoneAccount ( PhoneAccountHandle accountHandle ) { } public PhoneAccountHandle getSimCallManager ( ) { } public ComponentName getSystemSimCallManagerComponent ( ) { } public PhoneAccountHandle getSimCallManager ( int user ) { } public void setCurrentUserHandle ( UserHandle userHandle ) { } public boolean enablePhoneAccount ( PhoneAccountHandle accountHandle , boolean isEnabled ) { } private boolean isVisibleForUser ( PhoneAccount account ) { } private List < ResolveInfo > resolveComponent ( PhoneAccountHandle phoneAccountHandle ) { } private List < ResolveInfo > resolveComponent ( ComponentName componentName , UserHandle userHandle ) { } public List < PhoneAccountHandle > getAllPhoneAccountHandles ( ) { } public List < PhoneAccount > getAllPhoneAccounts ( ) { } public List < PhoneAccountHandle > getCallCapablePhoneAccounts ( String uriScheme , boolean includeDisabledAccounts ) { } public List < PhoneAccountHandle > getSimPhoneAccounts ( ) { } public List < PhoneAccountHandle > getPhoneAccountsForPackage ( String packageName ) { } public void registerPhoneAccount ( PhoneAccount account ) { } private void addOrReplacePhoneAccount ( PhoneAccount account ) { } public void unregisterPhoneAccount ( PhoneAccountHandle accountHandle ) { } public void clearAccounts ( String packageName , UserHandle userHandle ) { } public boolean isVoiceMailNumber ( PhoneAccountHandle accountHandle , String number ) { } public void addListener ( PhoneAccountRegistrar . Listener l ) { } public void removeListener ( PhoneAccountRegistrar . Listener l ) { } private void fireAccountsChanged ( ) { } private void fireDefaultOutgoingChanged ( ) { } private void fireSimCallManagerChanged ( ) { } private String getAccountDiffString ( PhoneAccount account1 , PhoneAccount account2 ) { } private void appendDiff ( StringBuffer sb , String attrName , Object obj1 , Object obj2 ) { } public boolean phoneAccountRequiresBindPermission ( PhoneAccountHandle phoneAccountHandle ) { } PhoneAccount getPhoneAccount ( PhoneAccountHandle handle ) { } public PhoneAccount getPhoneAccountCheckCallingUser ( PhoneAccountHandle handle ) { } private List < PhoneAccountHandle > getPhoneAccountHandles ( int capabilities , String uriScheme , String packageName , boolean includeDisabledAccounts ) { } private List < PhoneAccount > getPhoneAccounts ( int capabilities , String uriScheme , String packageName , boolean includeDisabledAccounts ) { } @ VisibleForTesting public static class State { public PhoneAccountHandle defaultOutgoing = null ; public final List < PhoneAccount > accounts = new CopyOnWriteArrayList < > ( ) ; public int versionNumber ; } public void dump ( IndentingPrintWriter pw ) { } private void write ( ) { } private void read ( ) { } private static void writeToXml ( PhoneAccountRegistrar . State state , XmlSerializer serializer , Context context ) throws IOException { } private static PhoneAccountRegistrar . State readFromXml ( XmlPullParser parser , Context context ) throws IOException , XmlPullParserException { } @ VisibleForTesting public static abstract class XmlSerialization < T > { private static final String LENGTH_ATTRIBUTE = "length" ; private static final String VALUE_TAG = "value" ; public abstract void writeToXml ( T o , XmlSerializer serializer , Context context ) throws IOException { } public abstract T readFromXml ( XmlPullParser parser , int version , Context context ) throws IOException , XmlPullParserException { } protected void writeTextIfNonNull ( String tagName , Object value , XmlSerializer serializer ) throws IOException { } protected void writeStringList ( String tagName , List < String > values , XmlSerializer serializer ) throws IOException { } protected void writeIconIfNonNull ( String tagName , Icon value , XmlSerializer serializer ) throws IOException { } protected void writeLong ( String tagName , long value , XmlSerializer serializer ) throws IOException { } protected List < String > readStringList ( XmlPullParser parser ) throws IOException , XmlPullParserException { } protected Bitmap readBitmap ( XmlPullParser parser ) { } protected Icon readIcon ( XmlPullParser parser ) throws IOException { } } @ VisibleForTesting public static final PhoneAccountRegistrar . XmlSerialization < PhoneAccountRegistrar . State > sStateXml = new PhoneAccountRegistrar . XmlSerialization < PhoneAccountRegistrar . State > ( ) { private static final String CLASS_STATE = "phone_account_registrar_state" ; private static final String DEFAULT_OUTGOING = "default_outgoing" ; private static final String ACCOUNTS = "accounts" ; private static final String VERSION = "version" ; @ Override public void writeToXml ( PhoneAccountRegistrar . State o , XmlSerializer serializer , Context context ) throws IOException { } @ Override public PhoneAccountRegistrar . State readFromXml ( XmlPullParser parser , int version , Context context ) throws IOException , XmlPullParserException { } } ; @ VisibleForTesting public static final PhoneAccountRegistrar . XmlSerialization < PhoneAccount > sPhoneAccountXml = new PhoneAccountRegistrar . XmlSerialization < PhoneAccount > ( ) { private static final String CLASS_PHONE_ACCOUNT = "phone_account" ;

Fix:
if ( ( ( TelephonyManager . getDefault ( ) . getPhoneCount ( ) ) > 1 ) && ( ( getAllPhoneAccounts ( ) . size ( ) ) == 1 ) ) {